JP3954964B2 - Natural ground reinforced earth method and natural ground reinforced earth member used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a natural ground reinforcing earth method and a natural ground reinforcing earth member used therefor, by preventing the dissipation of the self-hardening filler into the ground and the occurrence of cracks in the solidified hard hardening filler, A natural ground reinforcement earth method that increases the solidification strength of the self-hardening filler and stabilizes the ground such as slopes by increasing the integrity with the reinforced soil member and promoting the discharge of surplus water, etc. It is related with the natural ground reinforcement earth member used for it.
[0002]
[Prior art]
Conventionally, a natural ground reinforced earth method has been widely adopted to prevent the collapse of ground composed of embankments, cuts and the like.
This natural ground reinforcement earth work method reinforces the ground by inserting a reinforcing material such as a reinforcing bar into the excavation hole formed by drilling the target ground and injecting a self-hardening filler, and the entire ground (See Patent Document 1 and Patent Document 2).
[0003]
By the way, in the conventional ground reinforced earth method, since the self-hardening filler is directly injected into the excavation hole formed by drilling the ground, depending on the properties of the ground, the self-hardening filler may be There is a problem that the desired reinforcing strength cannot be obtained or the solidified filler is solidified and cracks are generated.
In addition, the excess water generated when the cement-based self-hardening filler, which is widely used as a self-hardening filler, solidifies, permeates the ground side, or the interface between the ground and the self-hardening filler solidified by leachate from the ground side. There was also a problem that the adhesion strength and the shearing force of the ground became weak and the desired reinforcement strength could not be obtained.
[0004]
Although it relates to earth anchors, in order to prevent the self-hardening filler from being dissipated into the ground and the solidified self-hardening filler from being cracked, the applicants first drilled the ground. A method of inserting a self-hardening filler into the formed excavation hole and inserting a self-hardening filler into the bag-like material has been proposed. It is still possible to solve the problem that the adhesion force and the shear force of the ground at the interface between the ground and the solidified self-hardening filler are weakened due to surplus water generated when the hard filler is solidified and leachate from the ground side. It was not possible, and a response to this was requested.
[0005]
[Patent Document 1]
JP 2000-303480 A [Patent Document 2]
JP 2002-4276 A [Patent Document 3]
Japanese Utility Model Publication No. 1-160032 [0006]
[Problems to be solved by the invention]
In view of the problems of the above-mentioned conventional ground-reinforced earth method, the present invention prevents the dissipation of the self-hardening filler into the ground and the occurrence of cracks in the solidified self-hardening filler, thereby preventing the ground and the ground. A natural ground reinforcement earth method that increases the solidification strength of the self-hardening filler and stabilizes the ground such as slopes by increasing the integrity with the reinforced soil member and promoting the discharge of surplus water, etc. It aims at providing the natural ground reinforcement earth member used for it.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the ground reinforcement method according to the present invention inserts a bag-like object whose tip is substantially the same as the excavation length of the excavation hole into an excavation hole formed by drilling the ground. Then, in the natural ground reinforced earth construction method in which the self-hardening filler is injected into the bag-like material, the bag-like material into which the self-hardening filler is injected is injected to the entire length by pressurizing the self-hardening filler. The diameter of the drainage material is extended over the entire length of the peripheral surface of the bag-like material, and the end of the drainage material is led out of the drilling hole. It is characterized by installing a bag-like material.
[0008]
In this natural ground reinforcement earthwork method, a bag-like object having a clogged end that is substantially the same as the excavation length of the excavation hole is inserted into an excavation hole formed by drilling the ground, and the bag-like object is automatically inserted. In the natural ground reinforcement earthwork method for injecting a hard filler, by injecting the self-hardening filler under pressure, the bag-like material into which the self-hardening filler has been injected is at least larger than the diameter of the drilling hole over its entire length. Since the diameter is greatly expanded, the self-hardening filler can be prevented from escaping into the ground and the solidified self-hardening filler can be prevented from cracking. In addition to compacting the surrounding ground, drainage from the ground can also be promoted.
Then, a drainage material is disposed on the circumferential surface of the bag-like material over its entire length, and the bag-like material is installed so that an end portion of the drainage material is led out of the excavation hole. Excess water generated when the self-hardening filler solidifies and leachate from the ground side can be discharged out of the excavation hole through the self-hardening filler and the drainage material in close contact with the ground.
[0009]
In this case, a reinforcing material can be inserted into the bag.
[0010]
Thereby, while reinforcing a self-hardening filler, the surrounding ground can be reinforced with a reinforcing material and the stability of the whole ground can be improved further.
[0011]
Moreover, what was narrowed down at least by the mouth part can be used for a bag-like thing.
[0012]
Thereby, the adhesive force and the shearing force of the ground at the interface between the self-hardening filler in which the bag-like material is solidified can be further improved.
[0013]
Moreover, what has an uneven | corrugated shape can be used for a bag-like thing.
[0014]
Thereby, the adhesive force in the interface of the ground and the hardened self-hardening filler can be further improved.
[0015]
Moreover, the 1st natural ground reinforcement earth member of the present invention used for the above natural ground reinforcement earth construction method is inserted in the excavation hole formed by perforating the ground, and the tip part to which cement system self-hardening filler is injected is used. In a natural ground reinforcing member made of a closed fiber bag, a sheet material made of a synthetic fiber cloth is formed on the inner surface of a grid material made of a synthetic resin net on the circumferential surface of the bag. It is characterized by disposing a drainage material made of a laminated body laminated so as to be on the outside.
[0016]
This natural ground reinforced soil member is a simple method for the natural ground reinforced soil construction method of the present invention by simply inserting a bag-like material having drainage material on its peripheral surface into a drilling hole formed by drilling a drainage material ground. And can be carried out smoothly.
In particular, even when a large pressure is applied from the ground, surplus water generated when the cement-based self-hardening filler solidifies and leachate from the ground side can be smoothly discharged out of the excavation hole through the drainage material. .
[0017]
Moreover, the 2nd natural ground reinforcement earth member of this invention used for the above natural ground reinforcement earth method is inserted in the excavation hole formed by perforating the ground, and the tip part into which cement system self-hardening filler is injected is used. A double-tissue bag-like material in which a ground structure is formed using multifilaments for warp and weft yarns , and warp yarns made of monofilaments functioning as drainage material in a ground pile reinforcing member made of a closed fiber bag-like material And a bag-like product made of fiber .
[0018]
This natural ground reinforced soil member is a simple method for the natural ground reinforced soil construction method of the present invention by simply inserting a bag-like material having drainage material on its peripheral surface into a drilling hole formed by drilling a drainage material ground. And can be carried out smoothly.
In particular, by forming the bag-like material and the drainage material integrally, it is possible to prevent the bag-like material and the drainage material from separating to form a gap, and this occurs when the cement-based self-hardening filler solidifies. Excess water and leachate from the ground side can be discharged quickly and smoothly outside the excavation hole.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a natural ground reinforcing earth method and a natural ground reinforcing earth member used therefor will be described below with reference to the drawings.
[0020]
In FIG. 1, one Example of the construction process of the natural ground reinforcement earthwork method of this invention is shown.
This ground-reinforced earth method is used for preventing collapse of the ground 1 made of embankment, cutting, etc. First, a large number of excavation holes 2 are formed substantially horizontally with respect to the ground 1 in the vertical and horizontal directions. Drilling is performed at a predetermined interval using a drilling tool such as a hand auger or a drill (FIG. 1A).
In this case, the diameter D and the excavation length L of the excavation hole 2 are designed according to the reinforcement strength to be obtained by the natural ground reinforcement earth method, the property of the ground, etc. Is set to about φ80 to φ100 mm, and the excavation length L is set to about 3 to 5 m.
[0021]
A bag-like object 3 with the tip portion of the excavation hole 2 closed is inserted into the excavation hole 2 formed in this manner, and cemented or other self-hardening is inserted into the bag-like object 3. The filler 5 is injected under pressure (FIG. 1 (b-1)). In addition, the mouth fitting 30a for connecting the metal fitting 30b of the injection hose of the self-hardening filler 5 can be attached to the mouth portion of the bag-like article 3 as necessary. Can be smoothly injected.
And by injecting the self-hardening filler 5 into the bag-like material 3 under pressure, the bag-like material 3 injected with the self-hardening filler material 5 is at least larger than the diameter D of the excavation hole 2 over its entire length. The diameter is increased (FIG. 1 (b-2)).
[0022]
In this case, the reinforcing material 6 such as a reinforcing bar is inserted into the bag-like object 3 as necessary with the spacer 61 supported so that the reinforcing material 6 is positioned at the approximate center of the excavation hole 2. Can do.
In the present embodiment, a deformed steel bar (for example, D19, D22, etc.) with good adhesion of the self-hardening filler 5 is used as the reinforcing material 6. An arbitrary cross-sectional shape such as a shape steel such as an H-shaped steel can be used, and further, a material made of FRP can be used in addition to a material made of steel.
Thereby, while reinforcing a self-hardening filler, the surrounding ground can be reinforced with a reinforcing material and the stability of the whole ground can be improved further.
[0023]
By the way, the bag-like product 3 used in the present embodiment is made of a synthetic fiber fabric and has a mouth portion and a tip portion that are narrowed as shown in FIG. 2 (a) (warp 31: nylon 1400T / 4 × 320, weft 32: polyester 1100T / 4, 8 / cm (density of large diameter part (φ180 mm)), 4.5 pieces / cm (density of small diameter part (φ80 mm))) and FIG. Furthermore, the thing of uneven | corrugated shape (The thing in which the diameter was varied in the longitudinal direction (large diameter part (phi) 130mm, small diameter part (phi) 80mm)) as shown to) can be used suitably.
As described above, by using the bag-like object 3 whose mouth portion is narrowed down, the pressure injection of the self-hardening filler into the bag-like object 3 can be smoothly performed. The diameter expansion can be performed uniformly over the entire length of the bag-like object 3, the adhesion force at the interface between the ground 1 and the solidified filler 5 and the shearing force of the ground can be improved, and the bag Adhesive force at the interface between the ground 1 and the solidified filler 5 that has solidified can be improved by using a material 3 having an uneven shape.
[0024]
Further, the bag-like object 3 used in the present embodiment is provided with a drainage material 4 on its peripheral surface over its entire length, and the end of the drainage material 4 is led out of the excavation hole 1. The bag-like object 3 is installed as shown in FIG.
Thereby, even when a large pressure is applied from the ground 1, as shown in FIGS. 1 (c-1) and (c-2), surplus water generated when the cement-based self-hardening filler 5 is solidified and the ground 1 side. The leachate from can be smoothly discharged out of the excavation hole 2 through the drainage material 4.
[0025]
Then, as shown in FIG. 1 (d), excess water or leaching is generated at the mouth portion (the fitting 30 a) of the bag-like object 3 installed so that the end portion of the drainage material 4 is led out of the excavation hole 1. The cap 7 is disposed so as not to hinder water discharge.
[0026]
By the way, as shown in FIG. 3, the drainage material 4 disposed on the peripheral surface of the bag-like object 3 used in this embodiment has a synthetic resin net (high-density polyethylene net, net wire diameter φ1 mm, mesh size). It is possible to use a laminate in which a grid material 41 made of 6 × 6 mm) is laminated on the inside and a sheet material 42 made of synthetic fiber cloth (polyester long fiber woven fabric or nonwoven fabric) is placed on the outside.
Further, as shown in FIG. 3A, the drainage material 4 may be configured such that a sheet-like laminate composed of a grid material 41 and a sheet material 42 is disposed on the surface of the bag-like material 3, or FIG. ), A sheet-like grid material 41 can be inserted into a cylindrical sheet material 42 and disposed so as to cover the surface of the bag-like object 3.
[0027]
More specifically, as shown in FIG. 4A, the bag-like object 3 and the drainage material 4 are inserted into the bag-like object 3 and the outer periphery thereof is inserted into the bag-like object 3. A tape 8 that can be stretched or broken such as a vinyl tape so that the diameter of the bag-like article 3 can be expanded when the self-hardening filler 5 is pressurized and injected (in this specification, simply referred to as “vinyl tape 8”). In addition, the sheet-like grid material 41 is inserted on the surface of the bag-like product 3 so as to cover the sheet-like material 42 (FIG. 3B). A cylindrical unitary structure is formed, and the unitary structure is inserted into the excavation hole 2 or, as shown in FIG. The outer periphery of the sheet material 42 is wound with a belt-like sheet material 42, and the end of the sheet material 42 is vinyl tape. To form a cylindrical integrated structure and insert the integrated structure into the excavation hole 2 or, as shown in FIG. By arranging a sheet-like laminate (FIG. 3 (c)) (three sheet-like pieces in this example) composed of the grid material 41 and the sheet material 42, and further winding the outer periphery with a vinyl tape 8 A cylindrical integrated structure is formed, and this integrated structure is inserted into the excavation hole 2 or, as shown in FIG. 4 (d), a grid is formed on the surface of a similar bag-shaped object 3. A sheet-shaped (strip-shaped) laminate (FIG. 3 (c)) (in this example, two strip-shaped bodies) composed of a material 41 and a sheet material 42 is wound around and placed in a tubular shape. An integral structure can be configured, and the integral structure can be inserted into the excavation hole 2.
Here, as shown in FIG. 4 (d), the self-hardening filler 5 is pressure-injected into the bag 3 by disposing the sheet-like (band-like) laminate so as to be wound around. When the bag-like product 3 expands into a concavo-convex shape by this, excess water generated when the cement-based self-hardening filler that tends to stay in the concave portion of the bag-like product 3 solidifies or leachate from the ground side, It can be quickly and smoothly discharged out of the excavation hole 1 through the drainage material 4.
[0028]
By the way, in the said Example, although the bag-like thing 3 and the drainage material 4 were comprised by another member, a bag-like thing and a drainage material can also be comprised integrally.
Specifically, as shown in FIG. 5, a ground structure is formed using multifilaments for the warp 31 and the weft 32, and a warp 41 a made of a monofilament (about φ1 mm) functioning as a drainage material is woven into this. A heavy tissue bag 3A and a bag 3B made of a synthetic fiber fabric as shown in FIGS. 2A and 2B are used in an overlapping manner.
In this case, the reinforcing material 6 is inserted into the double-structured bag-shaped material 3A, and the bag-shaped material 3B made of a synthetic fiber woven fabric is placed on the outer periphery thereof, and wrapped with the vinyl tape 8 and stopped. A solid integrated structure is formed, and the integrated structure is inserted into the excavation hole 2.
It is also possible to dispose a sheet material made of synthetic fiber cloth (polyester long fiber woven cloth or non-woven cloth) on the surface of the bag-like product 3 </ b> B and wind it with a vinyl tape 8 to stop it.
In this way, by integrally forming the bag-like material and the drainage material, it is possible to prevent the bag-like material and the drainage material from separating and forming a gap, thereby allowing the cement-based self-hardening filler to solidify. Surplus water and leachate from the ground side can be quickly and smoothly discharged out of the excavation hole 1.
[0029]
As described above, this ground-reinforced earth method is a bag-like object 3 (with a tip portion substantially the same as the excavation length L of the excavation hole 2 closed in an excavation hole 2 formed by drilling the ground 1. 3A, 3B) is inserted, and the self-hardening filler 5 is injected into the bag-like article 3 by injecting the self-hardening filler 4 under pressure by injecting the self-hardening filler 4 under pressure. Since the bag-like object 3 is expanded to have a diameter larger than at least the diameter D of the excavation hole 2 over its entire length, the self-hardening filler 5 is dissipated into the ground 1 and solidified self-hardening filler. 5 can be prevented, and the surrounding ground 1 can be compacted by increasing the diameter of the bag-like material 3 infused with the self-hardening filler 5, and further drainage from the ground 1 can be promoted.
In addition, the drainage material 4 (41a) is disposed over the entire length of the surface of the bag-like material 3 (3A), and the end of the drainage material 4 is led out of the excavation hole 2. Excavation holes through the drainage material 4 in close contact with the self-hardening filler 5 and the ground 1 can be used to remove surplus water generated when the cement-based self-hardening filler solidifies and leachate from the ground 1 side. 2 can be discharged outside.
[0030]
As mentioned above, although the natural ground reinforcement earth method of this invention and the natural ground reinforcement earth member used therewith were demonstrated based on the Example, this invention includes the structure (The material of a structural member, and a numerical value which were described in the said Example. The configuration can be changed as appropriate without departing from the spirit of the invention.
[0031]
In addition, the name of the present invention “the natural ground reinforcing earth method and the natural ground reinforcing earth member used therefor” is only given for clarifying its main use, and the present invention is the natural ground reinforcing earth method. In addition, the present invention can be applied to a similar method such as an earth anchor method using an earth anchor 9 as shown in FIG. 6, and this is not excluded.
[0032]
【The invention's effect】
The natural ground reinforced earth method of the present invention inserts a bag-like object having a clogged end substantially the same as the excavation length of the excavation hole into an excavation hole formed by drilling the ground. In the ground reinforcement method for injecting the self-hardening filler, the bag-like material injected with the self-hardening filler is injected at least with the diameter of the excavation hole over its entire length by injecting the self-hardening filler under pressure. Therefore, it is possible to prevent the self-hardening filler from escaping into the ground and the solidified self-hardening filler to crack, and to expand the bag-like material injected with the self-hardening filler. Depending on the diameter, the surrounding ground can be compacted, and drainage from the ground can also be promoted.
Then, a drainage material is disposed on the circumferential surface of the bag-like material over its entire length, and the bag-like material is installed so that an end portion of the drainage material is led out of the excavation hole. Excess water generated when the self-hardening filler solidifies and leachate from the ground side can be discharged out of the excavation hole through the self-hardening filler and the drainage material in close contact with the ground.
And by these, surplus water and leachate are discharged in a short time, and the strength expression of the self-hardening filler is accelerated, and the adhesion force and the ground at the interface between the ground and the self-hardening filler solidified through the bag-like material Shear strength can be improved, and the desired strength can be obtained without being affected by the properties of the ground and excess water. The ground can be reinforced in a short construction period, and the stability of the entire ground Can be reliably increased.
Moreover, it is possible to prevent surplus water (cement alkaline water) generated when the cement-based self-hardening filler is solidified from penetrating into the ground side, and to maintain the surrounding environment.
[0033]
Moreover, by inserting the reinforcing material into the bag-like material, the self-hardening filler can be reinforced, and the surrounding ground can be reinforced by the reinforcing material, thereby further improving the stability of the entire ground.
[0034]
In addition, by using a bag-like material that has been narrowed at least at the mouth portion, the pressure injection of the self-hardening filler into the bag-like material can be performed smoothly, and the diameter of the bag-like material can be increased. It can carry out uniformly over the full length of a bag-like thing, and can further improve the adhesive force in the interface of the ground and the solidified self-hardening filler, and the shearing force of the ground.
[0035]
Moreover, the adhesive force in the interface of the ground and the solidified self-hardening filler can be further improved by using a bag-like material having an uneven shape.
[0036]
Moreover, the 1st natural ground reinforcement earth member of the present invention used for the above natural ground reinforcement earth construction method is inserted in the excavation hole formed by perforating the ground, and the tip part to which cement system self-hardening filler is injected is used. In a natural ground reinforcing member made of a closed fiber bag, a sheet material made of a synthetic fiber cloth is formed on the inner surface of a grid material made of a synthetic resin net on the circumferential surface of the bag. Since the drainage material consisting of a laminate that is laminated to the outside is disposed, a bag-like material having drainage material disposed on the peripheral surface is inserted into an excavation hole formed by drilling the drainage material ground It is possible to simply and smoothly implement the natural ground reinforced earth method of the present invention.
In particular, even when a large pressure is applied from the ground, the excess water generated when the cement-based self-hardening filler solidifies and the leachate from the ground side are smoothly discharged out of the excavation hole through the drainage material. Can do.
[0037]
Moreover, the 2nd natural ground reinforcement earth member of this invention used for the above natural ground reinforcement earth method is inserted in the excavation hole formed by perforating the ground, and the tip part into which cement system self-hardening filler is injected is used. A double-tissue bag-like material in which a ground structure is formed using multifilaments for warp and weft yarns, and warp yarns made of monofilaments functioning as a drainage material in a ground pile reinforcing member made of a closed fiber bag-like material. And the bag-like material made of fiber, the bag-like material having the drainage material disposed on the peripheral surface is simply inserted into the excavation hole formed by drilling the drainage material ground. The natural ground reinforced earth method can be implemented easily and smoothly.
And in particular, the bag-like material and the drainage material are integrally formed, so that the bag-like material and the drainage material can be prevented from being separated to form a gap, whereby the cement-based self-hardening filler is solidified. Surplus water and leachate from the ground can be quickly and smoothly discharged out of the excavation hole.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows an embodiment of a construction process of a natural ground reinforced earth method according to the present invention, where (a) is a drilling process, (b-1) is a bag-like material insertion and a self-hardening filler pressure injection process. , (B-2) is an enlarged state of the bag-like material, (c-1) and (c-2) are enlarged views of part A of (b-2), when the cement-based self-hardening filler is solidified. (D) is an explanatory view showing a state where a cap is disposed, respectively, in a state in which surplus water generated from the ground and leachate from the ground side are discharged to the outside of the excavation hole through the drainage material.
FIG. 2 is an explanatory view of a bag-like object.
FIG. 3 is an explanatory view of a drainage material.
FIG. 4 is an explanatory view showing a combination of a bag and a drainage material.
FIGS. 5A and 5B show a case in which a bag-like object and a drainage material are integrally formed, where FIG. 5A is an installed state, FIG. 5B is a mouth part of the bag-like object, and FIG. (D) is explanatory drawing which shows an assembly process, respectively.
FIG. 6 is an explanatory diagram of an earth anchor method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground 2 Excavation hole 3 Bag-like thing 3A Bag-like thing 3B Bag-like thing 4 Drainage material 41 Grid material 41a Warp which consists of monofilament 42 Sheet material 5 Self-hardening filler 6 Reinforcement material 7 Cap 8 Vinyl tape

Claims (6)

A natural ground in which a bag-like object having a clogged length substantially equal to the excavation length of the excavation hole is inserted into an excavation hole formed by drilling the ground, and a self-hardening filler is injected into the bag-like substance. In the reinforced earth work method, the pressure-injection of the self-hardening filler causes the bag-like material into which the self-hardening filler has been injected to expand over the entire length at least larger than the diameter of the excavation hole. A natural ground reinforcement soil characterized in that drainage material is disposed on the peripheral surface of the object over its entire length, and a bag-like material is installed so that the end of the drainage material is led out of the excavation hole. Construction method.   2. The natural ground reinforced earth method according to claim 1, wherein a reinforcing material is inserted into the bag.   The ground-reinforced earth method according to claim 1 or 2, wherein the bag-like material is narrowed down at least at the mouth.   4. The natural ground reinforced earth method according to claim 1, 2 or 3, wherein the bag-like object has an uneven shape. In a natural ground reinforcement member made of a fiber-like bag with a clogged tip, which is inserted into an excavation hole formed by drilling the ground and filled with cement-based self-hardening filler, on the peripheral surface of the bag In addition, a drainage material made of a laminate in which a grid material made of a synthetic resin net is laminated on the inside and a sheet material made of a synthetic fiber cloth on the outside is arranged over the entire length. A natural soil reinforced soil member. Inserted into a drilling hole formed by drilling the ground and injected with cement-based self-hardening filler, in a ground reinforcement member consisting of a fiber-like bag with a closed end, multifilaments are used for warp and weft. A ground-reinforced soil that is formed by laminating a double-sacked bag-like material in which warps made of monofilaments that function as a drainage material are woven together and a fiber-like bag-like material. Element.

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